Datasheet > LM1291

LM1291

更新时间： 2024-09-22 22:51:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	207K
描述
Video PLL System for Continuous-Sync Monitors

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LM1291 数据手册

June 1995

LM1291

Video PLL System for Continuous-Sync Monitors

General Description

Features

Wide continuous autosync rangeÐ22 kHz to 125 kHz

(1:5.7) with no component switching or external adjust-

ments

The LM1291 is an integrated horizontal time base solution

specifically designed to operate in continuous-sync video

monitors. It automatically synchronizes to any H frequency

from 22 kHz to 125 kHz and provides the drive pulse to the

high power deflection circuit.

No manufacturing trims requiredÐinternal VCO capaci-

tor trimmed on chip

No costly high-precision components needed

Low phase jitter (1.3 ns at 100 kHz)

DC controlled H phase and duty cycle

Video mute pulse for blanking during H frequency

transitions

Available sync processing includes a vertical sync separator

and a composite video sync stripper. An internal sync selec-

tion scheme gives highest priority to separate H and V sync,

then composite sync, and finally sync on video; no external

switching between sync sources is necessary. The LM1291

provides polarity-normalized H/HV and V sync outputs,

along with logic flags which show the respective input polar-

ities.

Input sync prioritization

Clamp pulse position and width control

Continuous clamp pulse output, even with no sync input

Resistor-programmable minimum and maximum VCO

frequency

The design uses an on-chip FVC (Frequency-to-Voltage

Converter) to set the center frequency of the VCO (Voltage-

Controlled Oscillator). This technique allows autosync oper-

ation over the entire frequency range using just one opti-

mized set of external components.

X-ray input disables H drive and mutes video until V

powered down

9.5V

H drive disabled for V

The system includes a second phase detector which com-

pensates for storage time variation in the horizontal output

transistor; the picture’s horizontal position is thus indepen-

dent of temperature and component variance.

Horizontal output transistor protected against accidental

turn-on during flyback

Capacitor-programmable frequency ramping, df /dt,

VCO

H output transistor during scanning mode

protects

changes

The LM1291 provides DC control pins for H Drive duty cycle

and flyback phase.

Connection Diagram

TL/H/12323–1

FIGURE 1

Order Number LM1291N

See NS Package Number N28B

1995 National Semiconductor Corporation

TL/H/12323

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...12

中文翻译

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与LM1291相关器件

型号	品牌	获取价格	描述	数据表
LM1291N	NSC	获取价格	Video PLL System for Continuous-Sync Monitors
LM1292	NSC	获取价格	Video PLL System for Continuous-Sync Monitors
LM1292N	NSC	获取价格	Video PLL System for Continuous-Sync Monitors
LM1295	NSC	获取价格	DC Controlled Geometry Correction System for Continuous Sync Monitors
LM1295N	NSC	获取价格	DC Controlled Geometry Correction System for Continuous Sync Monitors
LM1296	NSC	获取价格	Raster Geometry Correction System for Multi-Frequency Displays
LM1296N	NSC	获取价格	Raster Geometry Correction System for Multi-Frequency Displays
LM129AGMW8	FAIRCHILD	获取价格	IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, UUC, WAFER, Voltage Reference
LM129AH	Linear	获取价格	6.9V Precision Voltage Reference
LM129AH	NSC	获取价格	Precision Reference

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